<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品照片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- Tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name" style="width: 666px"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number" style="width: 666px"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" style="width: 666px" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" style="width: 666px" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 复选框组 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="Valve" v-for="(Valve, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到后台的API地址 -->
            <!-- on-preview表示预览图片事件 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                       list-type="picture" :headers="headersObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">请上传商品的相关的照片</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="addBtn" @click="addClick">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览区域 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
  export default {
    name: "AddGoods",
    data() {
      return {
        activeIndex: '0',
        // 添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: '',
          goods_number: '',
          goods_weight: '',
          // 商品所属的分类数组
          goods_cat: [],
          // 图片数据
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        // 添加商品表单数据验证
        addFormRules: {
          goods_name: [
            {
              required: true, message: '请输入商品名称', trigger: 'blur'
            }
          ],
          goods_price: [
            {
              required: true, message: '请输入商品价格', trigger: 'blur'
            }
          ],
          goods_weight: [
            {
              required: true, message: '请输入商品重量', trigger: 'blur'
            }
          ],
          goods_number: [
            {
              required: true, message: '请输入商品数量', trigger: 'blur'
            }
          ],
          goods_cat: [
            {
              required: true, message: '请选择商品', trigger: 'blur'
            }
          ]
        },
        // 商品分类数组
        cateList: [],
        // 级联选择器要显示的参数
        cateProps: {
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 上传图片的URL地址
        uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
        // 图片上传组件的headers请求头对象
        headersObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        // 预览商品照片的地址URL
        previewPath: '',
        // 控制预览图片对话框的显示与隐藏
        previewVisible: false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有商品分类数据
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取获取商品分类数据失败！')
        }
        this.cateList = res.data
      },
      // 级连选择器选中项变化，会触发这个函数
      handleChange() {
        // 只能选中三级分类
        if (this.addForm.goods_cat.length !== 3) {
          return this.addForm.goods_cat = []
        }
      },
      // 控制标签页的切换
      beforeTabLeave(activeName, oldActiveName) {
         if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
           this.$message.error('请选择商品分类')
           return false
         }
      },
      // 当前激活面板函数
      async tabClicked() {
        // 证明访问的动态参数面板
        if (this.activeIndex === '1') {
          const { data: res } = await this.$http.get(`categories/${ this.cateId }/attributes`, {params: {sel: 'many'}})
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态列表失败！')
          }
        // 转换成数组类型
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
          })
          this.manyTableData = res.data
        }
        else if (this.activeIndex === '2') {
          const { data: res } = await this.$http.get(`categories/${ this.cateId }/attributes`, { params: { sel: 'only'} })
          if (res.meta.status !== 200) {
            return this.$message.error('获取静态属性失败！')
          }
          this.onlyTableData = res.data
        }
      },
      // 处理图片预览效果
      handlePreview(file) {
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      // 处理移除图片的操作
      handleRemove(file) {
        // 1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tem_path
        // 2.从pics数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pics === filePath)
        // 3. 调用数组的splice方法，把图片信息对象，从pics数组移除
        this.addForm.pics.splice(i, 1)
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
        // 1.拼接得到一个图片信息对象
        const picInfo = { pic: response.data.tmp_path}
        // 2.将图片信息对象，Push到pics数组
        this.addForm.pics.push(picInfo)
      },
      // 添加商品
      addClick() {
       // 预验证
        this.$refs.addFormRef.validate( async valid => {
          if (!valid) {
            return this.$message.error('请填写完整必要的表单项！')
          }
          // 执行添加
          // 深拷贝 lodash  cloneDeep（obj）
          const form = _.cloneDeep(this.addForm)
          // 将数组转换成字符串
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(',') }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form);
          // 发起网络请求提交添加商品,商品名称必须唯一
          const { data:res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          }
          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      // 选中商品的Id
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style scoped>
  .el-steps {
    margin: 15px 0;
  }
  .el-checkbox {
    /* 上、右、下、左 */
    margin: 0 10px 0 0 !important;
  }
  /* 预览图片的宽度 */
  .previewImg {
    width: 100%;
  }
  .addBtn {
    margin-top: 15px;
  }
</style>